Cite this page: Pernick N. Congo red. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/stainscongored.html. Accessed April 23rd, 2019.
Definition / general
- Also called amyloid stain
- Must examine stained tissue with standard and polarized light
- Amyloid under polarized light has apple green birefringence, based on the molecule being in an antiparallel beta-pleated sheet.
- Note: non-amyloid related green birefringence can occur due to excess dye retained by the tissue
Microscopic (histologic) images